Hey you guys I just recently purchased a KWA KMP9 NS2 and I've been having problems the very day I bought it. I believe something is wrong with the hop up bucking because the bbs jam. I assure you it's not the quality of the bbs I use only high grade precision bbs. I use them on all my AEGS and GBBS and never had a problem. I have bought different bbs to check if it was the bbs I use but the problem persists. I have cleaned the inner barrel to check for any dirt but again the problem persists. I have dry fired the GBB by locking the spring on the magazine and every shot sounds different like the piston hits against the hopup bucking also ...when I turn the hopup up or down is the whole hopup up bucking suppose to turn with it? Because that's where I believe my problem is...also the hop up bucking looks like it's sticking out a little because the feeding ramp touches the bucking it actually squishes it..that's where I believe my problem lies...also I tried lubing the hopup bucking and it does fire bbs but at 290fps with .20gs.... So I need to find out how to disassemble the barrel casting which contains the hop up and barrel to replace the hop up bucking.. If anyone can help ...that will be great!!

Yea I have tried no hop up and everything in between but what's my real concern is that the hopup bucking moves left or right when I adjust the hop up.... This causes the Bb to significantly shoot to the left if my hopup is on or to the right if my hop up is off and it's still shooting at 290fps. So I just need to know how to get the hop up out off of the barrel so does anyone know how to?

you can take the hop up bucking and wash it off with detergent soap. KWA or KSC bucking tends to absorb silicone oil quickly. Or get a new bucking, KWA gbb works well when their hop up bucking are dry. That's what I notice with all their GBB.

you can take the hop up bucking and wash it off with detergent soap. KWA or KSC bucking tends to absorb silicone oil quickly. Or get a new bucking, KWA gbb works well when their hop up bucking are dry. That's what I notice with all their GBB.

Thanks man it worked!! I got the hop up bucking out and washed it. The problem was that the bucking was not in the correct position and caused the nozzle to hit against the bucking early and that's what lowered my fps now it's back to 380-400 fps thanks man really appreciate the help!

I got the kmp9 from a friend, and have gotten all the problems sorted out besides the swollen bucking (causing the bb to shoot straight up about 40 feet at no hop setting). Ive gotten the little metal ball and the c clip out of the hop up but the adjuster (piece 91) wont slide off. Is it because it is too swollen? Also, i ran the inner barrel and hop up under hot water and cleaned with soap, but it barely helped. I want to clean just the bucking, and maybe buy a new one entirely.